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-18=5u+7
We move all terms to the left:
-18-(5u+7)=0
We get rid of parentheses
-5u-7-18=0
We add all the numbers together, and all the variables
-5u-25=0
We move all terms containing u to the left, all other terms to the right
-5u=25
u=25/-5
u=-5
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